RETA CIRO CERTIFICATION PRACTICE EXAM Questions with Answers & Rationales | Latest Update 2026

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RETA CIRO CERTIFICATION PRACTICE EXAM Questions with Answers &
Rationales | Latest Update 2026



Question 1
What does the CIRO certification primarily demonstrate?
A. Ability to design refrigeration systems
B. Competency in safely operating and maintaining industrial
refrigeration systems
C. Electrical engineering skills
D. HVAC sales knowledge
Answer: B
Rationale: CIRO (Certified Industrial Refrigeration Operator)
validates an operator’s knowledge and skills in safe industrial
refrigeration operations and maintenance.


Question 2
Which organization offers the CIRO certification?
A. EPA
B. ASHRAE
C. RETA (Refrigerating Engineers and Technicians Association)
D. OSHA



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Answer: C
Rationale: RETA administers the CIRO certification program for
industrial refrigeration operators.


Question 3
Which refrigerant is most commonly used in industrial
refrigeration systems?
A. R-22
B. R-134a
C. Ammonia (R-717)
D. R-410A
Answer: C
Rationale: Ammonia is widely used in industrial refrigeration
due to its high efficiency and low cost.


Question 4
Under ASHRAE classification, ammonia is a:
A. A1 refrigerant
B. B2 refrigerant
C. A3 refrigerant
D. B1 refrigerant



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Answer: B
Rationale: Ammonia is classified as B2—toxic and slightly
flammable.


Question 5
What is the approximate lower flammability limit (LFL) of
ammonia in air?
A. 1%
B. 5%
C. 15%
D. 25%
Answer: C
Rationale: Ammonia’s lower flammability limit is about 15% by
volume in air.


Question 6
What is the OSHA permissible exposure limit (PEL) for
ammonia?
A. 10 ppm
B. 25 ppm
C. 50 ppm
D. 100 ppm


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